(共25张PPT)
Unit 13
We’re trying to save the earth.
Section A 3a~4c
What did you see in the video
food chains 食物链
ocean ecosystem 生态系统
shark
鲨鱼
Many people think that sharks are too strong to be endangered, but they are wrong.
The sharks are endangered!
Read the passage quickly
Para.1 A. Two groups against “finning”.
Para.2 B. Something about shark fin soup.
Para.3 C. Sharks are endangered now.
鳍
shark fin soup
1. Where is shark fin soup popular
2. What does it mean when people enjoy a bowl of shark fin soup
Read Para. 1
southern China
They’re killing a whole shark when
they enjoy a bowl of shark fin soup.
How do people kill the sharks
1. How do people deal with them when they catch the sharks
2. Without a fin, what will happen to a shark
They cut off their fins throw them back into the ocean.
It will die.
Read Para. 2
1.Why is it harmful to the environment
2. What do the two numbers mean
70 million
90 percent
Sharks are at the top of the food chain, so if their numbers drop too low, it will bring danger to all ocean life.
Around 70 million sharks are caught and traded every year.
The numbers of some kinds of sharks have fallen by over 90 percent
in the past 20 to 30 years.
Read Para. 3
2. What are they doing & what have they done
1. What are the two environmental protection groups
Read Para. 3
1. What are the two environmental protection groups
美国野生救援会(WildAid)是1999年在美国注册的非盈利机构，总部在美国旧金山，
它对濒临绝迹的野生动物提供直接的保护，并且发展许多有创意的计划，以教育大众关于野生动物及生态平衡的重要性。
世界自然基金会(WWF)是在全球享有盛誉的、最大的独立性非政府环境保护组织之一，自1961年成立以来，WWF一直致力于环保事业，在全世界拥有超过500万支持者和超过100个国家参与的项目网络。
Read Para. 3
2. What are they doing & what have they done
They are teaching the public about “finning”.
They have even asked governments to develop laws(法律) to stop the sale of shark fins.
Are the shark fins good for health？
No scientific studies have shown that shark fins are good for health.
No sale no killing.
没有买卖，就没有杀害。
Protecting wild animals is just protecting ourselves.
保护野生动物就是保护我们人类自己。
Don’t let our children can only see today’s animals in the museums.
不要让我们的孩子只能在博物馆里才能见到今天的动物。
Grammar focus
本单元复习现在进行时、used to句型、被动语态、现在完成时和情态动词。
现在进行时
(1) 含义：表示正在发生或进行的动作。
(2) 基本结构：
主语 + be + 现在分词（be 的形式随主语的变化而变化）
(3) 基本用法：
①表示现在正在进行的动作。特征：常常与now或具体的时间连用，有时句中会有感官动词来提示，或通过上下文来暗示。
②表示现阶段一直进行的动作。这类动词常常是延续性动词。常于at present, this week, these days等连用。
③表示主语的特征、性格、能力等
本单元复习现在进行时、used to句型、被动语态、现在完成时和情态动词。
现在完成时
(1) 含义：表示过去发生的动作对现在还有影响。
(2) 基本结构：主语 + have / has + 过去分词
(3) 基本用法：
①表示过去发生的动作，但强调对现在产生影响。特征：不能与表示具体的时间状语连用。
②表示过去发生的动作或存在的状态一直延续到现在，还可能继续下去。常常与since, for, in the past + 时间名词，in the last +时间名词等时间状语连用，而且谓语动词要求是延续性动词。
③表示一种“经历或体验”，即可以表示经历过也可以是从来都没有经历过。
本单元复习现在进行时、used to句型、被动语态、现在完成时和情态动词。
被动语态
初中阶段我们学习了七种被动结构，归纳如下：
(1) 一般现在时是被动语态：am / is / are + 过去分词
(2) 现在完成时的被动式：have / has + been + 过去分词
(3) 现在进行时的被动式：am/ is/ are + being + 过去分词
(4) 一般过去时的被动式：was / were + 过去分词
(5) 过去进行时的被动式：was / were + being + 过去分词
(6) 过去完成时的被动式：had + been + 过去分词
(7) 一般将来时的被动式：will / be going to be+ 过去分词
(8) 含有情态动词的被动式：情态动词+be +动词的过去分词。
本单元复习现在进行时、used to句型、被动语态、现在完成时和情态动词。
情态动词
情态动词表示说话人对某一动作或状态的态度，如认为“可能”、“应当”、“必要”等。情态动词本身有一定的意义，但不能单独作谓语，也没有人称和数的变化。后面一般跟动词原形。
本单元复习现在进行时、used to句型、被动语态、现在完成时和情态动词。
used to句型
used to意为“过去常常做某事”，指的是过去的习惯性动作，目的在于与现在形成对照。used to是个情态动词，其中的to是不定式符号，后面跟动词原形。
在美式英语中,它的疑问式是：Did ＋主语＋use to do sth.？否定式是：主语＋didn't use…
在英式英语中，它的疑问式应当是：Used ＋主语＋to sth.？否定式应当是used not to或use(d)n’t to。
He used to stay up late. 他过去常熬到很晚。
4a
Fill in the blanks with the correct forms of the verbs in brackets.
Joe: _____you ever _____ (take) part in an environmental project
Ken: Yes, I have. I ______ (help) with a Clean-Up Day last year. It was__________(consider) the biggest clean-up project this city ever ________(have).
Joe: How many people ______ (take) part
Ken: I _____ (think) more than 1,000 people _____(come) to help out.
Joe: That’s fantastic! I guess everyone in this city is _____ (try) to improve the environment.
Ken: Yes, we can't affort to _____ (wait) any longer to take action!
Have taken
helped
considered
had had
took
think
came
trying
wait
4b
Fill in the blanks with the correct forms of the verbs in brackets.
People _____ think that big things _____ be done. However, many forget that saving the earth begins with small things. For example, you _____ save electricity by turning off the lights when you leave a room. You _____ also use paper or reusable bags instead of plastic bags. I think it’s a great idea that you now _______ pay for plastic bags in some stores. And instead of driving to school or work, you _____ ride your bike or walk. If it’s far, you take the bus. All these small things ______ add up and become good things that _____improve the environment. Let’s take action now!
may
should
could
would
have to
can
could
can
4c
Make a list fo things that people can do to help the environment and discuss your list with your partner.
A: I think that everyone should use public transportation.
B: I disagree. It’s difficult for parents with young children to use public transportation…
Homework
老师可以在这里布置作业噢~
